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Plans for the laser system of the SPARC Frascati test photoinjector

Plans for the laser system of the SPARC Frascati test photoinjector . SPARC Laser group C. Vicario, A. Ghigo, F. Tazzioli, I. Boscolo, S. Cialdi. Laser performances. Laser layout. Laser pulse simulation. e n is 1.3 m m, and does not degrade for:. Phase jitter=one degree RF rms

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Plans for the laser system of the SPARC Frascati test photoinjector

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  1. Plans for the laser system of the SPARC Frascati test photoinjector SPARC Laser group C. Vicario, A. Ghigo, F. Tazzioli, I. Boscolo, S. Cialdi

  2. Laser performances

  3. Laser layout

  4. Laser pulse simulation en is 1.3 mm, and does not degrade for: • Phase jitter=one degree RF rms • Emitted charge variation 1% rms (0.3% IR energy) • Rise-Fall time 1 psrms

  5. Effect of cathode spot ellipticity on emittance 95% circularity can be obtain with conventional optics(cylindrical lens) enx,eny V. Fusco – Homdyn sim. Ellipticity

  6. Time pulse shaper Phase only modulation preserves optical band To perform pulse stretching!! Specified flat top can be obtained by phase only Modulation (see fig. of non amplified pulse) D. Meshulach, D. Yelin, Y. Silberberge J. Opt. Soc. Am., B 15 (1998) 1615

  7. Liquid crystal spatial light phase modulator in Fourier plane

  8. Collinear Acousto-Optic modulator (AOM) F. Verluise and al, Opt. Lett.25,8 (2000)

  9. Comparison between optical modulators

  10. Energy budget Losses: Pinhole flattener 62% Optics 38% 3th harmonic generation 90% 20 mJ in IR needed to obtain 500 mJ on cathode @ 266 nm and so 1 nC • Stability of high energy amplified pulses is an issue. • Improvements in cathodes quantum efficiency simplifies the problem.

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